Late-Quaternary Activity of the Gumudi Fault of the South Fukang Fault Belt on the North Margin of the Bogda Mountains in the Xinjiang Automonous Region

• 责任者：Wu Chuanyong (Seismological Bureau of Xinjiang ; Urumqi830011 ; China) ; Shen Jun
• 刊名：Quaternary Sciences
• 出版年：2010
• 卷期：30(5)
• 关键词：活动构造 ; active tectonics ; 博格达山 ; Bogeda Mountains
• 页码：p.1020-1029
• 索书号：P515.206/633-4
• 图表：7 illus., 1 table, 35 refs.
• 分类号：0300
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

In the paper, the Late-Quaternary deformation characteristics were studied by detailed analysis of offset terraces and deformed alluvial fans and by thermoluminescence dating. Displacements of river terraces and alluvial fans widely occurred along the Gumudi fault segment. At Dahonggou, the second-level terrace was offset across the fault, with a vertical distance of 6 m, but the first-level terrace is very flat without any deformation. However, the sandy gravel at the bottom of the first-level terrace was dislocated about 1.4 m. According to the vertical offsets and related TL dating results, the average vertical slip rate of the Gumudi fault was calculated to be about 0.27 mm/a since Late Pleistocene and 0.13～0.18 mm/a since Holocene. It is obvious that the slip rate of the fault since Holocene is smaller than that since Pleistocene.